I have a Canon Rebel. I am using Mac OS X Lion. When I download my Raw images onto my computer, they are just black squares where the pictures should be. I have tried in Lightroom 3, Lightroom 4, and iPhoto. All the same thing....

Are you using a card reader or a cable directly from the camera? Using a card reader has been known to solve this problem for some. From my recollection using the version prior to the present one, iPhoto doesn't read RAW files.

I used an USB cable that connects to my camera to upload the photos straight into Lightroom. I also tried using this to upload straight to iPhoto. I have the newest version of iPhoto, but maybe it still doesn't work? But Lightroom definitely should...

I don't have a card reader but I guess if that's the only solution I would definitely get one... I was just hoping someone had a different solution. Thanks!

I had this problem too and found an old post stating that it was the fact that I was using the camera connected via USB. As soon as I plugged it into a card reader all my CR2's showed up and I could import them. Not sure why it is this way but it is...